Nipper for tuft weaving



July 12, 1927,. 1,635,670

E. F, HATHAWAY NIPPER FOR TUFT WEAVING Filed F eb. 2'7. 192s JNmvTok BY ATTORNEY Patented July 12, 1927.

. "STATES PATENT OFFICE.

EDGAR r. HATHAWA or wELLEsLEY, MAssacrnrs 'rrs, AssIGNoajro si-zmwmur ENGINEERING COMPANY, or BOSTON, MASSACHUSETTS, A CORPORATION E MAS- sAcnUsErrs.

NIPPER FOR TUFT WEAVING.

Application filed February 27, 1926. Serial No. 91,238.

This invention relates to yarn nippers for tuft weaving by which the individual tufts of yarn to besupplied to*-the,fabric are transferred from a suitable yarn-carrier 6 after severanoeto position between the warp threads in the loom. a a 7 Such. nippers comprise. aipai'r "of thin sheetmetal jaws pivotallyjointed together, face to face, so asto lie in the same plane.

10 AS the entire thickness of acomplete nipper is barely-over onessixteenth of. an inch, and

as there must be "no lateral projection to catch against the warp threads between which the nippers must pass to insert the yarn tufts, the provision of a pivotal joint construction that shalt-be stiff enough to preserve and maintain the alignment of the.

gripping jaws in the same plane and posi tively prevent their accidental separation has resented a serious problem in this art. eretofore the contacting portions of. the jaw members have been reduced'to about one-half thickness, and a short rivet of a length correspondingto the thickness of the of the reduced portions and headed down into thecounterbored outside faces of the assembled jaws to lie flush with theoutside, but as each jawat this point isjonly-about inch thick and the holding actionof the necessarily very .small counter-boreis but 7 slight,- it is natural "that; the 'jawsi'should easily get out of alignment and frequently pull apart, thus causing imperfect weaving of the fabric and injury tothe loom.

- In'dealing with the roblem I have devised a construction which dispenses with the customary pivotal rivet-andwhich provides a fulcral pivotal joint formed by iiitegral' interlocking engaged portions of the two jaws; Another feature resides in the construction-by which] the reduced portion of one member is engaged byan overhanging portion projecting from the full thickness of the other; member so that itis reinforced against buckling or springing from its normal plane. By providing an interlocking engagement around the periphery instead of merely at the centre of the attaching m'emberof one jaw a much broader "holding engagement is afforded to resist lateral 'ortwisting strains on either" jaw; in

fact by providing interlocking engagement in which n'ipperhas been inserted in registering holes or pressed metal.

both near the centre and at the periphery of the attaching member a very rigid deas vice, fully satisfyingthe most exacting requirements is produced. I In the accompanying drawings ,I' have illustrated a pair of nippers constructed according to the principles of this invention, 00

Figure l is a side elevation of a completely assembled nipper device embodying the invention. v a

Figure, 2 is a cross section on the plane 2-2 of Figure 1 looking in the direction of the arrows.

rigure 3 is a detail view showing: part of the main or supporting jaw before assembly in the'complete device. j i

Figure 4 is a cross sectional view on the plane H of i igure 3 viewed in the direction of the arrows. v v

Figure 5 is a detail view showing a side elevation of the supported pivotal jaw be.-

I fore its assemblage into the complete structure. a j v Figure 6 is a cross sectional View on the plane 66 of Fi ures looking in therdirection of the arrows. a T

In the practice of my invention, accord ing to the form illustrated in the drawings, the two pivotal jaws 1 and 2'may have the usual contour and are made of thin sheet s5 The main or supporting jaw 1 of the couple. is made with av counter-bored recess of segmental form extending haif way through the jaw andwhose peripheral circular wall 3 extends through an arc of substantially more than a half circle so that its ends, at the inner edge ofthe :jaw'l, are distant substantially less than the diameter of the circle from each other.

' The other jaw 2 is provided'with a segmental attaching member-. 10, whose circular peripheraledge is dimensioned to fit inside the segmental recess of part 1, and is inwardly beveled as shown at 11'. This attaching member 10 is also reduced to one-half the thicknessiofthebody portion of the jaw 2, being cut away 'onits rear face so that when it is inserted in the segmental recess, against the bottom wall 6 thereof, its outer face will lie flush with the main 'loli surface of the jaw l, as shown in Figure 2.

(iii

The recessed or rmluccd portion of the jaw 1 centrally bored. as shown at i, for the purpose of torniing the centering guide for the c nu1ter-boring tool. and around this central opening is left an annular ridge or boss 5. having the full thickness of the body portion of the jaw 1 so that tbc scgmcntal recess is really of annular form. The underside of the reduced portion 6 undercut or beveled as to that portion which projects beyond the two angularly disposed arms of the jaw 1. The reduced portion of the jaw 2 is circular throughout, thus leaving an arcuate wall as shown by the dotted lines at 13 in Figure 55. j i i It will be understood that prior to the assembly of the two devices into operative relation the cutting away of the surfaces to form alcuate peripheral walls on the two jaws leaves those walls at right angles to the side faces of the respective jaws. Hence the attaching mon'iber 10 can be titted smoothly inside the 'egmental pocket with its peripheral edge in contact with the arcuate wall 3 bounding the stegn'iental recess, and with the central aperture l2 in the attaching member surrounding the annular boss 5 of the jaw 1.

In this assembled position the lateral faces of the two jaws are flush with each other but there is nothing to prevent: their separating.

Accordingly, by means of a suitable die embracing circular V-shaped ribs, the engaging walls of each member are crowded in or upset to overhang the arcuate beveled edge portions of the other member, as clearly illustrated in Figure 2. This upsetting tool, to produce this dove-tailed or interlocking joint, is properly centered through the medium of the centering apertures 4-.

It will be observed that the limited oscillation of the jaw 2 on its sulfiporting jaw 1 is permitted by this arrangement, while at the same time, instead of having merely the central portions of the two jaws co11- nectcd by an attaching rivet as heretofore, the peripheral portion of the attaching member is interlocked with or overhung by the inwardly upset boundary wall 3 inside of the circular upsetting grooves fil, while the beveled inside edge of the recess '12 of the jaw 2 is overhung by the overlapping or upset lip 5 of the central boss which is forced in when forming the circular i'ipsetting groove 5 in said boss.

Therefore, the attacliing member is strongly held at its periphery as well as its in terior point and in both places is engaged by an overhanging lip projecting from the full thickness of the jaw. \Vith this ar 'angement therefore the possibility of the two jaws springing apart, under ordinary conditions ofservice, is practically eliminated and per feet alignment between the gripping teeth at 1 and 2, in the yarn-nipping ends of the jaws, is always maintained. and preserved. Each reduced portion, therefore, affords complete reinforcement from the other and is engaged by an overhanging portion of the full thickness of the metal.

What I claim is:

1. A yarn-gripping device for tuft weaving, embracing in its construction a pair of flat sheet metal jaws pivotally jointed together to lie in the same plane by integrally formed interlocking portions forming circular dovetailed engagement one with the other to prevent their separation. .1

2. A yarn-nipping Cl8VlC8fOI"*tUft weaving, embracing in its construction a pair of pivotally connected grippingjaws of sheet metal comprising a supporting jaw formed on one face with a shallow recess of. segmental form extending toone edge thereof, and a pivotal jaw having a segmental por-. tion dimensioned to fit and turn inside said recess, the adjacent circularly curved engaging portions of the two jaws being partially lapped one over the other to prevent their separation while permitting limited pivotal movement of the jaws in the same plane.

3. A nipper for tuftweaving, embracing in its construct-ion two sheet metal jaws having respectively segmental male and female portions in dove-tailed engagement one with the other, thereby allowing the jaws to open and close in the same plane while preventing their separation.

4. A nipper for tuft weaving embracing in its construction two sheet metal jaws pivotally connected together to lie in the same plane and formed respectively with male and female segmental portions having circular dove-tailed engagement both interiorly and peripherally, substantially as described.

5. A yarn nipper for tuft weaving embracing two thin sheet metal jaws pivotally connected to lie in the same plane onejaw being formed with a segmental recess extending to its edge to form a counter-sunk bearingr seat, the other being formed with a segmental attaching and bearing member hav ing a beveled peripheral edge adapted to fit into said recess and to underlie adjacent overhanging portions of the companion jaw.

6. A yarn nipper for tuft Weaving embra ring two pivotally connected yarn-gripping jaws each formed with circular bearing portions of reduced thickness to permit as semblage of the two jaws with their outside faces in flush relation, the reducedportions being operatively secured together by Integral lip portions of one member overhang ing beveled edge portions of the other,

T. A yarn nipper for tuft weaving en bracing two jaws pivotally secured together, i i

one of which has a circular attachingin'iemher of reduced thickness seated in a counterbored recess in the other, the attaching member being overlapped interiorly and peripherally by overhanging portions of the recessed member.

.8. A yarn nipper for tuft weaving embracing in combination two pivotally connected sheet metal gripping jaws lying in thesame plane, one of which has a circular V attaching member of'reduced thickness rotatably seated in a circular recess of the other, the two members being inseparably .and rotatively connected by peripheral retaining lips extending throughout an entire circle.

In witness whereof, I have subscribed the above specification. EDGAR F. HATHAWAY.

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